CAJ | 학술논문

研究了黄河流域9个沉积物对磷的吸附行为,用修改后的Langmuir等温吸附模型对吸附实验数据进行了拟合,得到最大吸附容量PAC、Langmuir吸附平衡常数k.利用所得拟合参数通过公式计算方法得到EPC_0,以此判断沉积物是磷"源"还是磷"汇",分析了沉积物组成及其理化性质与磷吸附特征的关系.结果表明,各沉积物的吸附,解吸平衡磷浓度EPC_0范围在0.0031～0.109 3 mg/L,,其值也较低,与可解吸的内源磷含量正相关,与地理位置没有表现出相关性.在本研究条件下,在壶口张家湾断面,沉积物对磷表现为"汇";而其他沉积物对磷表现为"源",但释放量和吸附量不大.黄河沉积物对磷的最大吸附容量PAC的范围为0.073～0.454 mg/L,吸附能力较弱,沉积物的最大吸附容量与沉积物的有机质有较好的正相关关系.此外,沉积物对磷的吸附存在明显的固体浓度C_S效应,吸附滞后角随着C_S的增加而增大,随着同体浓度的增加,沉积物对P的吸附量逐渐降低,但EPCC_0值却增大,体现了颗粒物在磷循环中的两性作用.
연구료황하류역9개침적물대린적흡부행위,용수개후적Langmuir등온흡부모형대흡부실험수거진행료의합,득도최대흡부용량PAC、Langmuir흡부평형상수k.이용소득의합삼수통과공식계산방법득도EPC_0,이차판단침적물시린"원"환시린"회",분석료침적물조성급기이화성질여린흡부특정적관계.결과표명,각침적물적흡부,해흡평형린농도EPC_0범위재0.0031～0.109 3 mg/L,,기치야교저,여가해흡적내원린함량정상관,여지리위치몰유표현출상관성.재본연구조건하,재호구장가만단면,침적물대린표현위"회";이기타침적물대린표현위"원",단석방량화흡부량불대.황하침적물대린적최대흡부용량PAC적범위위0.073～0.454 mg/L,흡부능력교약,침적물적최대흡부용량여침적물적유궤질유교호적정상관관계.차외,침적물대린적흡부존재명현적고체농도C_S효응,흡부체후각수착C_S적증가이증대,수착동체농도적증가,침적물대P적흡부량축점강저,단EPCC_0치각증대,체현료과립물재린순배중적량성작용.
Adsorption behavior of phorsphorus on Yellow River sediments was determined in laboratory. The modified Langmuir isotherm equation was used to describe phosphate(P) sorption on the Yellow River sediments. The maximum P sorption capacity(PAC) and P-binding energy constant(k) were obtained by the modified Langmuir isotherm model. The zero equilibrium P concentration(EPC_0) was subsequently calculated by the corresponding formulae, which was used to predict whether bed sediments are acting as a source or sink of soluble reactive phosphate. The correlation between chemical-physical properties of the sediments and their phosphorus characteristics was analyzed. The EPC_0 of the sediments ranged from 0.003 1 to 0.109 3 mg·L~(-1), which was positively correlated to the contents of native adsorbed P(NAP). The sediments played a dual role of sink and source of P at different geographical sites. Sediment from Hukou and Zhangjiawan were sinks of phosphorus, while other sediments were sources of the river water. However, both the sorption and desorption capacities were low at the conditions tested here. The NAP was linearly related to the contents of organic matter in sediment. In addition, solid concentration(C_s) effect exists obviously in P adsorption experiment and the hysteresis and EPC_0 became bigger as C_s increased.